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Reduction of High Soil Test Phosphorus by Corn and Soybean Varieties

USDA-ARS, Dep. of Agronomy and Horticulture, Univ. of Nebraska-Lincoln, Lincoln, NE, 68583

View larger version (55K): [in a new window]   Fig. 1. Soil P levels in the 0- to 15- and 15- to 30-cm depths for 10 treatments during 4 yr of corn production without P application in eastern Nebraska. The vertical bars are standard errors, CN is compost for N, CP is compost for P, MN is manure for N, MP is manure for P, FR is inorganic fertilizer, CK is check, and 2Y indicates biennial application.

View larger version (23K): [in a new window]   Fig. 2. Phosphorus removal in corn grain as influenced by grain yield level in 1999 and 2000 in the corn hybrids study in central Nebraska.

View larger version (17K): [in a new window]   Fig. 3. Phosphorus removal in irrigated soybean grain as influenced by grain yield level in the soybean varieties study in central Nebraska.